I have a client with SBS2011 - I have migrated them to Office 365 email.
The SBS2011 box is in decent shape and provides the basic File Share / security services that they need.
I would like to remove Exchange 2010 from the SBS2011 so that there is more resources available to the server.
Eventually client would like to bring in new server with new OS, to Active Directory and eventually remove the old SBS2011.
So it would be nice to have AD without the Exchange traces in it.